library(tidyverse)     # for data cleaning and plotting
library(lubridate)     # for date manipulation
library(openintro)     # for the abbr2state() function
library(palmerpenguins)# for Palmer penguin data
library(maps)          # for map data
library(ggmap)         # for mapping points on maps
library(gplots)        # for col2hex() function
library(RColorBrewer)  # for color palettes
library(sf)            # for working with spatial data
library(leaflet)       # for highly customizable mapping
library(carData)       # for Minneapolis police stops data
library(ggthemes)      # for more themes (including theme_map())
theme_set(theme_minimal())
# Starbucks locations
Starbucks <- read_csv("https://www.macalester.edu/~ajohns24/Data/Starbucks.csv")

starbucks_us_by_state <- Starbucks %>% 
  filter(Country == "US") %>% 
  count(`State/Province`) %>% 
  mutate(state_name = str_to_lower(abbr2state(`State/Province`))) 

# Lisa's favorite St. Paul places - example for you to create your own data
favorite_stp_by_lisa <- tibble(
  place = c("Home", "Macalester College", "Adams Spanish Immersion", 
            "Spirit Gymnastics", "Bama & Bapa", "Now Bikes",
            "Dance Spectrum", "Pizza Luce", "Brunson's"),
  long = c(-93.1405743, -93.1712321, -93.1451796, 
           -93.1650563, -93.1542883, -93.1696608, 
           -93.1393172, -93.1524256, -93.0753863),
  lat = c(44.950576, 44.9378965, 44.9237914,
          44.9654609, 44.9295072, 44.9436813, 
          44.9399922, 44.9468848, 44.9700727)
  )

#COVID-19 data from the New York Times
covid19 <- read_csv("https://raw.githubusercontent.com/nytimes/covid-19-data/master/us-states.csv")

Put your homework on GitHub!

If you were not able to get set up on GitHub last week, go here and get set up first. Then, do the following (if you get stuck on a step, don’t worry, I will help! You can always get started on the homework and we can figure out the GitHub piece later):

  • Create a repository on GitHub, giving it a nice name so you know it is for the 4th weekly exercise assignment (follow the instructions in the document/video).
  • Copy the repo name so you can clone it to your computer. In R Studio, go to file –> New project –> Version control –> Git and follow the instructions from the document/video.
  • Download the code from this document and save it in the repository folder/project on your computer.
  • In R Studio, you should then see the .Rmd file in the upper right corner in the Git tab (along with the .Rproj file and probably .gitignore).
  • Check all the boxes of the files in the Git tab under Stage and choose commit.
  • In the commit window, write a commit message, something like “Initial upload” would be appropriate, and commit the files.
  • Either click the green up arrow in the commit window or close the commit window and click the green up arrow in the Git tab to push your changes to GitHub.
  • Refresh your GitHub page (online) and make sure the new documents have been pushed out.
  • Back in R Studio, knit the .Rmd file. When you do that, you should have two (as long as you didn’t make any changes to the .Rmd file, in which case you might have three) files show up in the Git tab - an .html file and an .md file. The .md file is something we haven’t seen before and is here because I included keep_md: TRUE in the YAML heading. The .md file is a markdown (NOT R Markdown) file that is an interim step to creating the html file. They are displayed fairly nicely in GitHub, so we want to keep it and look at it there. Click the boxes next to these two files, commit changes (remember to include a commit message), and push them (green up arrow).
  • As you work through your homework, save and commit often, push changes occasionally (maybe after you feel finished with an exercise?), and go check to see what the .md file looks like on GitHub.
  • If you have issues, let me know! This is new to many of you and may not be intuitive at first. But, I promise, you’ll get the hang of it!

Instructions

  • Put your name at the top of the document.

  • For ALL graphs, you should include appropriate labels.

  • Feel free to change the default theme, which I currently have set to theme_minimal().

  • Use good coding practice. Read the short sections on good code with pipes and ggplot2. This is part of your grade!

  • When you are finished with ALL the exercises, uncomment the options at the top so your document looks nicer. Don’t do it before then, or else you might miss some important warnings and messages.

Warm-up exercises from tutorial

These exercises will reiterate what you learned in the “Mapping data with R” tutorial. If you haven’t gone through the tutorial yet, you should do that first.

Starbucks locations (ggmap)

  1. Add the Starbucks locations to a world map. Add an aesthetic to the world map that sets the color of the points according to the ownership type. What, if anything, can you deduce from this visualization?
# Get the map information
world <- get_stamenmap(
    bbox = c(left = -180, bottom = -57, right = 179, top = 82.1), 
    maptype = "terrain",
    zoom = 2)

ggmap(world) + # creates the map "background"
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude, color = `Ownership Type`), 
             alpha = .3, 
             size = .2) +
  theme_map() +
  labs(title = "Starbucks Ownership Around the World")

Based on the visualization above, Starbucks in North and South America are mostly Company Owned and Licensed. In Asia and Europe, however, there are many Joint Venture Starbucks in addition to Company Owned and Licensed Starbucks.

  1. Construct a new map of Starbucks locations in the Twin Cities metro area (approximately the 5 county metro area).
twincities <- get_stamenmap(
    bbox = c(left = -93.4471, bottom = 44.8173, right = -92.7838, top = 45.1316), 
    maptype = "terrain",
    zoom = 11)

ggmap(twincities) + # creates the map "background"
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude), 
             alpha = 1, 
             size = 2) +
  labs(title = "Starbucks in the Twin Cities", 
       x = "Longitude", 
       y = "Latitude")

  theme_map()
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  1. In the Twin Cities plot, play with the zoom number. What does it do? (just describe what it does - don’t actually include more than one map).

Smaller numbers in zoom show less detail, while bigger numbers show more detail.As the zoom number gets bigger, the map becomes more detailed, so if you have a small area the zoom number can be bigger and thus more detailed, but if the area is bigger, the zoom number has to be smaller and less detailed.

  1. Try a couple different map types (see get_stamenmap() in help and look at maptype). Include a map with one of the other map types.
twincities <- get_stamenmap(
    bbox = c(left = -93.4471, bottom = 44.8173, right = -92.7838, top = 45.1316), 
    maptype = "terrain-lines",
    zoom = 11)

ggmap(twincities) + # creates the map "background"
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude), 
             alpha = 1, 
             size = 2,
             color = "lightgreen") +
  labs(title = "Starbucks in the Twin Cities") +
  theme_map()

  1. Add a point to the map that indicates Macalester College and label it appropriately. There are many ways you can do think, but I think it’s easiest with the annotate() function (see ggplot2 cheatsheet).
twincities <- get_stamenmap(
    bbox = c(left = -93.4471, bottom = 44.8173, right = -92.7838, top = 45.1316), 
    maptype = "terrain-lines",
    zoom = 11)

ggmap(twincities) + # creates the map "background"
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude), 
             alpha = 1, 
             size = 2, 
             color = "lightgreen") +
  annotate(geom = "text", y = 44.9416, x = -93.16, label = "Macalester College")  +
  labs(title = "Starbucks in the Twin Cities") +
  theme_map()

Choropleth maps with Starbucks data (geom_map())

The example I showed in the tutorial did not account for population of each state in the map. In the code below, a new variable is created, starbucks_per_10000, that gives the number of Starbucks per 10,000 people. It is in the starbucks_with_2018_pop_est dataset.

census_pop_est_2018 <- read_csv("https://www.dropbox.com/s/6txwv3b4ng7pepe/us_census_2018_state_pop_est.csv?dl=1") %>% #read csv into r and creates a new dataset called census_pop_est_2018
  separate(state, into = c("dot","state"), extra = "merge") %>% #The state data was presented with a period preceding the state name. The separate function separates the period from the other characters. 
  select(-dot) %>% #selects all variables/columns except "dot"
  mutate(state = str_to_lower(state)) #turns the state string into all lowercase letters

starbucks_with_2018_pop_est <- #creates new dataset 
  starbucks_us_by_state %>% 
  left_join(census_pop_est_2018,
            by = c("state_name" = "state")) %>% #joins starbucks_us_by_state dataset with the census_pop dataset. since the starbucks_us dataset calls the state variable "state_name" and the census dataset calls the state variable "state", the by line matches those two variables to the same one. 
  mutate(starbucks_per_10000 = (n/est_pop_2018)*10000) #creates variable to show the number of Starbucks per 10,000 people per state
  1. dplyr review: Look through the code above and describe what each line of code does.

  2. Create a choropleth map that shows the number of Starbucks per 10,000 people on a map of the US. Use a new fill color, add points for all Starbucks in the US (except Hawaii and Alaska), add an informative title for the plot, and include a caption that says who created the plot (you!). Make a conclusion about what you observe.

#US states map information - coordinates used to draw borders
states_map <- map_data("state")

# map that colors state by number of Starbucks
starbucks_with_2018_pop_est %>% 
  ggplot() +
  geom_map(map = states_map,
           aes(map_id = state_name,
               fill = n/est_pop_2018*10000)) +
  geom_point(data = Starbucks %>%
               filter(`Country` == "US") %>%
               filter(`State/Province` != "AK") %>%
  filter(`State/Province` != "HI"), 
             aes(x = Longitude, y = Latitude), 
             alpha = .3, 
             size = .1, 
             color = "goldenrod") +
  expand_limits(x = states_map$long, y = states_map$lat) + 
  scale_fill_viridis_c(option = "plasma") +
  theme_map() +
  labs(title = "Starbucks per 10,000 people",
       fill = "Starbucks per 10,000 People",
       caption = "Plot created by Anna Leidner")

#Lighter colors (more Starbucks per 10,000 people) are related to the population size of a city, like in New York, the lighter yellow shows where New York City is, where there are going to be more Starbucks. California shows a similar pattern, where the two splotches of yellow are likely where San Francisco and Los Angeles are.

A few of your favorite things (leaflet)

  1. In this exercise, you are going to create a single map of some of your favorite places! The end result will be one map that satisfies the criteria below.
  • Create a data set using the tibble() function that has 10-15 rows of your favorite places. The columns will be the name of the location, the latitude, the longitude, and a column that indicates if it is in your top 3 favorite locations or not. For an example of how to use tibble(), look at the favorite_stp_by_lisa I created in the data R code chunk at the beginning.
#Anna's favorite places 

favorite_by_anna <- tibble(
  place = c("Kimchi Tofu House", "Tono Pizzeria + Cheesesteak", 
            "Macalester College", "Science Museum of Minnesota", "Target Field", 
            "Saint Paul Home", "Riverside Park", "NYC Home", 
            "Jin Fong Restaurant", "The High Line", "Citi Field", 
            "Kate's Seafood", "Long Nook Beach"), 
  long = c( -93.22693673444148, -93.16733278846144, 
           -93.16905451640325, -93.09913377060474,   
           -93.27759701544593, -93.15993888846154,
           -73.9729219893889, -73.9717327732488, 
           -73.97883524441367,  -74.0039163349285, 
           -73.84583203092146, -70.11022135787704,
           -70.03705415706891), 
  lat = c(44.97333972848076, 44.934273777055594, 
          44.93861924693568, 44.946322266714894,  
          44.9818947558888, 44.93189077914104, 
          40.801862889204585, 40.79972265717478, 
          40.78301103574647, 40.751173188177894, 
          40.75725834451115, 41.75483506515295, 
          42.02195492958253), 
  top3 = c("Not Top 3", "Not Top 3", "Top 3", "Not Top 3", "Not Top 3", "Not Top 3", "Top 3", "Top 3", "Not Top 3", "Not Top 3", "Not Top 3", "Not Top 3", "Not Top 3")
)
  • Create a leaflet map that uses circles to indicate your favorite places. Label them with the name of the place. Choose the base map you like best. Color your 3 favorite places differently than the ones that are not in your top 3 (HINT: colorFactor()). Add a legend that explains what the colors mean.
factpal <- colorFactor(topo.colors(3), favorite_by_anna$top3)

leaflet(data = favorite_by_anna) %>% 
  addProviderTiles(providers$Stamen.Terrain) %>% 
  addCircles(lng = ~long, 
             lat = ~lat, 
             label = ~place, 
             weight = 5, 
             opacity = 1,
             color = ~factpal(top3))  %>%
  addPolylines(lng = ~long, 
               lat = ~lat, 
               color = col2hex("darkred")) %>%
  addLegend(pal = factpal, 
            values = ~top3, 
            opacity = 0.5, 
            title = NULL,
            position = "bottomright") 
  • Connect all your locations together with a line in a meaningful way (you may need to order them differently in the original data). I reordered the points so that the NYC Home, the home I grew up in, is the midpoint between the points in Massachusetts and Minnesota.

  • If there are other variables you want to add that could enhance your plot, do that now.

Revisiting old datasets

This section will revisit some datasets we have used previously and bring in a mapping component.

Bicycle-Use Patterns

The data come from Washington, DC and cover the last quarter of 2014.

Two data tables are available:

  • Trips contains records of individual rentals
  • Stations gives the locations of the bike rental stations

Here is the code to read in the data. We do this a little differently than usualy, which is why it is included here rather than at the top of this file. To avoid repeatedly re-reading the files, start the data import chunk with {r cache = TRUE} rather than the usual {r}. This code reads in the large dataset right away.

data_site <- 
  "https://www.macalester.edu/~dshuman1/data/112/2014-Q4-Trips-History-Data.rds" 
Trips <- readRDS(gzcon(url(data_site)))
Stations<-read_csv("http://www.macalester.edu/~dshuman1/data/112/DC-Stations.csv")
  1. Use the latitude and longitude variables in Stations to make a visualization of the total number of departures from each station in the Trips data. Use either color or size to show the variation in number of departures. This time, plot the points on top of a map. Use any of the mapping tools you’d like.
stationTrips <- Trips %>%
   left_join(Stations, 
            by = c("sstation" = "name")) %>%
  #select(sstation, client) %>%
  group_by(lat, long) %>%
  mutate(total = n()) 
  #summarize(n = n()) 


washingtondc <- get_stamenmap(
    bbox = c(left = -77.1869, bottom = 38.8107, right = -76.8374, top = 38.9684), 
    maptype = "terrain",
    zoom = 12
)
ggmap(washingtondc) +
  geom_point(data = stationTrips, 
             aes(x = long, y = lat, color = total),
             size = .8) +
  scale_color_viridis_c(option = "magma") +
  theme_map() +
  #theme(legend.background = element_blank()) +
  labs(title = "Total Number of Departures By Station", 
       fill = guide_legend("Number of Departures"))

  1. Only 14.4% of the trips in our data are carried out by casual users. Create a plot that shows which area(s) have stations with a much higher percentage of departures by casual users. What patterns do you notice? Also plot this on top of a map. I think it will be more clear what the patterns are.
washingtondc <- get_stamenmap(
    bbox = c(left = -77.1869, bottom = 38.8107, right = -76.8374, top = 38.9684), 
    maptype = "terrain",
    zoom = 12
)

stationTrips <- stationTrips %>%
  mutate(propcasual = mean(client == "Casual"))

ggmap(washingtondc) +
  geom_point(data = stationTrips, 
             aes(x = long, y = lat, color = propcasual),
             size = .8) +
  scale_color_viridis_c(option = "magma") +
  theme_map() +
  labs(title = "Percentage of Departures by Client Type", 
       fill = "Proportion Casual Users")

  #+
  #theme(legend.background = element_blank())

I notice that in the map above, the proportion of Casual Clients is higher near the heart of that downtown area and where the National Mall is. One of the pale dots is near the Lincoln Memorial and the other is near the Washington Monument. This makes sense as they would be the areas with the highest population of tourists/casual users.

COVID-19 data

The following exercises will use the COVID-19 data from the NYT.

  1. Create a map that colors the states by the most recent cumulative number of COVID-19 cases (remember, these data report cumulative numbers so you don’t need to compute that). Describe what you see. What is the problem with this map?
#covid19$state <- tolower(covid19$state)

covid19_state <- covid19 %>%
  group_by(state) %>%
  arrange(desc(date)) %>%
  #mutate(cases = as.character(cases)) %>%
  mutate(cases = as.integer(cases)) %>%
  mutate(state = tolower(state)) %>%
  slice(1) 
  
states_map <- map_data("state")

covid19_state %>%
  ggplot() +
  geom_map(map = states_map, 
           aes(map_id = state, 
           fill = cases)) +
  
  expand_limits(x = states_map$long, y = states_map$lat) +
  theme_map() +
  #scale_fill_viridis_c(option = "plasma") +

  #scale_fill_viridis_c(option = "plasma", direction = -1) +
  labs(title = "Cumulative COVID Cases in the US", 
       fill = "Cumulative Cases", 
       caption = "Plot Created by Anna Leidner")

In the map above, we see that the most recent cumulative number of COVID cases per state. The darker the color/the closes to dark purple, the higher the number of cumulative cases is. The results are to be expected as the states with the largest populations like California, Texas, Florida, and New York, have had the highest number of cumulative COVID cases. The map does not show how many COVID cases there are in relation to the population/does not take population into account.

  1. Now add the population of each state to the dataset and color the states by most recent cumulative cases/10,000 people. See the code for doing this with the Starbucks data. You will need to make some modifications.
census_pop_est_2018 <- read_csv("https://www.dropbox.com/s/6txwv3b4ng7pepe/us_census_2018_state_pop_est.csv?dl=1") %>% #read csv into r and creates a new dataset called census_pop_est_2018
  separate(state, into = c("dot","state"), extra = "merge") %>% #The state data was presented with a period preceding the state name. The separate function separates the period from the other characters. 
  select(-dot) %>% #selects all variables/columns except "dot"
  mutate(state = str_to_lower(state)) #turns the state string into all lowercase letters

covid19_state <- covid19 %>%
  group_by(state) %>%
  arrange(desc(date)) %>%
  #mutate(cases = as.character(cases)) %>%
  mutate(cases = as.integer(cases)) %>%
  mutate(state = tolower(state)) %>%
  slice(1) 

covid19_10000 <- #creates new dataset 
  covid19_state %>% 
  left_join(census_pop_est_2018,
            by = c("state"))  #joins starbucks_us_by_state dataset with the census_pop dataset. since the starbucks_us dataset calls the state variable "state_name" and the census dataset calls the state variable "state", the by line matches those two variables to the same one. 
  #mutate(starbucks_per_10000 = (n/est_pop_2018)*10000) #creates variable to show the number of Starbucks per 10,000 people per state

covid19_10000 %>% 
  ggplot() +
  geom_map(map = states_map,
           aes(map_id = state,
               fill = cases/est_pop_2018*10000)) +
  expand_limits(x = states_map$long, y = states_map$lat) + 
  #scale_fill_viridis_c(option = "plasma") +
  theme_map() +
  labs(title = "Cumulative COVID Cases per 10,000 people",
       fill = "Cases per 10,000",
       caption = "Plot created by Anna Leidner")

  1. CHALLENGE Choose 4 dates spread over the time period of the data and create the same map as in exercise 12 for each of the dates. Display the four graphs together using faceting. What do you notice?

Minneapolis police stops

These exercises use the datasets MplsStops and MplsDemo from the carData library. Search for them in Help to find out more information.

  1. Use the MplsStops dataset to find out how many stops there were for each neighborhood and the proportion of stops that were for a suspicious vehicle or person. Sort the results from most to least number of stops. Save this as a dataset called mpls_suspicious and display the table.
mpls_suspicious <- MplsStops %>%
  group_by(neighborhood) %>% #this finds total stops by neighborhood
  #mutate(totneighbor = n()) %>%
  #distinct(neighborhood, .keep_all=TRUE) %>%
  mutate(stops = n(),
         prop_suspicious = mean(problem == "suspicious")) %>%
  #slice(1) %>% #do i need this
  arrange(desc(stops)) #%>%
  #select(neighborhood:prop_suspicious)

mpls_suspicious
  1. Use a leaflet map and the MplsStops dataset to display each of the stops on a map as a small point. Color the points differently depending on whether they were for suspicious vehicle/person or a traffic stop (the problem variable). HINTS: use addCircleMarkers, set stroke = FAlSE, use colorFactor() to create a palette.
factpal <- colorFactor(topo.colors(5), MplsStops$problem)

leaflet(data = MplsStops) %>% 
  addProviderTiles(providers$Stamen.Terrain) %>% 
  addCircles(lng = ~long, 
             lat = ~lat, 
             label = ~neighborhood, 
             weight = 5, 
             opacity = 1,
             stroke = FALSE,
             color = ~factpal(problem)) %>%
  
  addLegend(pal = factpal, 
            values = ~problem, 
            opacity = 0.5, 
            title = NULL,
            position = "bottomright") 
  1. Save the folder from moodle called Minneapolis_Neighborhoods into your project/repository folder for this assignment. Make sure the folder is called Minneapolis_Neighborhoods. Use the code below to read in the data and make sure to delete the eval=FALSE. Although it looks like it only links to the .sph file, you need the entire folder of files to create the mpls_nbhd data set. These data contain information about the geometries of the Minneapolis neighborhoods. Using the mpls_nbhd dataset as the base file, join the mpls_suspicious and MplsDemo datasets to it by neighborhood (careful, they are named different things in the different files). Call this new dataset mpls_all.
mpls_nbhd <- st_read("Minneapolis_Neighborhoods/Minneapolis_Neighborhoods.shp", quiet = TRUE)

mpls_all <- mpls_nbhd %>%
  left_join(mpls_suspicious, 
            by = c("BDNAME" = "neighborhood")) %>%
  left_join(MplsDemo, 
            by = c("BDNAME" = "neighborhood"))
mpls_all
  1. Use leaflet to create a map from the mpls_all data that colors the neighborhoods by prop_suspicious. Display the neighborhood name as you scroll over it. Describe what you observe in the map.
#pal2 <- colorFactor(topo.colors(5), mpls_all$prop_suspicious)

pal2 <- colorNumeric("magma",
                    domain = mpls_all$prop_suspicious)
## Error in colorNumeric("magma", domain = mpls_all$prop_suspicious): object 'mpls_all' not found
leaflet(data = mpls_all) %>% 
  addProviderTiles(providers$Stamen.Terrain) %>% 
  addCircles(lng = ~long, 
             lat = ~lat, 
             label = ~BDNAME, 
             weight = 3, 
             opacity = 1,
             color = ~pal2(prop_suspicious)) %>%
  addLegend(pal = pal2,
            values = ~prop_suspicious,
            opacity = 0.5,
            title = NULL,
            position = "bottomright")
## Error in structure(list(options = options), leafletData = data): object 'mpls_all' not found

In the map, there is a clear lines separating different neighborhoods by different suspicious proportions. I would have to guess that the neighborhoods with the darker dots (smaller proportion of suspicious stops), are more likely to be White neighborhoods, while the neighborhoods with the more yellow dots (larger proportion of suspicious stops), are more likely to be neighborhoods with a larger population of people of color.

  1. Use leaflet to create a map of your own choosing. Come up with a question you want to try to answer and use the map to help answer that question. Describe what your map shows.
#Do the number of suspicious police stops change based on the demographics of the neighborhood?

#pal3 <- colorFactor(topo.colors(5), mpls_all$stops)
pal3 <- colorNumeric("magma",
                    domain = mpls_all$stops)
## Error in colorNumeric("magma", domain = mpls_all$stops): object 'mpls_all' not found
leaflet(mpls_all) %>% 
  addProviderTiles(providers$Esri.NatGeoWorldMap) %>% 
  addCircles(lng = ~long,
             lat = ~lat,
             color = ~pal3(stops),
             label = ~race, 
             weight = .3,
             opacity = .4) %>% 
  addLegend("topleft",
            pal = pal3,
            values = ~stops)
## Error in structure(list(options = options), leafletData = data): object 'mpls_all' not found

When looking at the above map, it seems as though the number of stops is affected by the population of the area, or density of commuters. The number of stops does seem loosely correlated with the suspicious proportion, but the correlation is not extremely strong or clear.

---
title: 'Weekly Exercises #4'
author: "Anna Leidner"
output: 
  html_document:
    keep_md: TRUE
    toc: TRUE
    toc_float: TRUE
    df_print: paged
    code_download: true
---


```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE, error=TRUE, message=FALSE, warning=FALSE)
```

```{r libraries}
library(tidyverse)     # for data cleaning and plotting
library(lubridate)     # for date manipulation
library(openintro)     # for the abbr2state() function
library(palmerpenguins)# for Palmer penguin data
library(maps)          # for map data
library(ggmap)         # for mapping points on maps
library(gplots)        # for col2hex() function
library(RColorBrewer)  # for color palettes
library(sf)            # for working with spatial data
library(leaflet)       # for highly customizable mapping
library(carData)       # for Minneapolis police stops data
library(ggthemes)      # for more themes (including theme_map())
theme_set(theme_minimal())
```

```{r data}
# Starbucks locations
Starbucks <- read_csv("https://www.macalester.edu/~ajohns24/Data/Starbucks.csv")

starbucks_us_by_state <- Starbucks %>% 
  filter(Country == "US") %>% 
  count(`State/Province`) %>% 
  mutate(state_name = str_to_lower(abbr2state(`State/Province`))) 

# Lisa's favorite St. Paul places - example for you to create your own data
favorite_stp_by_lisa <- tibble(
  place = c("Home", "Macalester College", "Adams Spanish Immersion", 
            "Spirit Gymnastics", "Bama & Bapa", "Now Bikes",
            "Dance Spectrum", "Pizza Luce", "Brunson's"),
  long = c(-93.1405743, -93.1712321, -93.1451796, 
           -93.1650563, -93.1542883, -93.1696608, 
           -93.1393172, -93.1524256, -93.0753863),
  lat = c(44.950576, 44.9378965, 44.9237914,
          44.9654609, 44.9295072, 44.9436813, 
          44.9399922, 44.9468848, 44.9700727)
  )

#COVID-19 data from the New York Times
covid19 <- read_csv("https://raw.githubusercontent.com/nytimes/covid-19-data/master/us-states.csv")

```

## Put your homework on GitHub!

If you were not able to get set up on GitHub last week, go [here](https://github.com/llendway/github_for_collaboration/blob/master/github_for_collaboration.md) and get set up first. Then, do the following (if you get stuck on a step, don't worry, I will help! You can always get started on the homework and we can figure out the GitHub piece later):

* Create a repository on GitHub, giving it a nice name so you know it is for the 4th weekly exercise assignment (follow the instructions in the document/video).  
* Copy the repo name so you can clone it to your computer. In R Studio, go to file --> New project --> Version control --> Git and follow the instructions from the document/video.  
* Download the code from this document and save it in the repository folder/project on your computer.  
* In R Studio, you should then see the .Rmd file in the upper right corner in the Git tab (along with the .Rproj file and probably .gitignore).  
* Check all the boxes of the files in the Git tab under Stage and choose commit.  
* In the commit window, write a commit message, something like "Initial upload" would be appropriate, and commit the files.  
* Either click the green up arrow in the commit window or close the commit window and click the green up arrow in the Git tab to push your changes to GitHub.  
* Refresh your GitHub page (online) and make sure the new documents have been pushed out.  
* Back in R Studio, knit the .Rmd file. When you do that, you should have two (as long as you didn't make any changes to the .Rmd file, in which case you might have three) files show up in the Git tab - an .html file and an .md file. The .md file is something we haven't seen before and is here because I included `keep_md: TRUE` in the YAML heading. The .md file is a markdown (NOT R Markdown) file that is an interim step to creating the html file. They are displayed fairly nicely in GitHub, so we want to keep it and look at it there. Click the boxes next to these two files, commit changes (remember to include a commit message), and push them (green up arrow).  
* As you work through your homework, save and commit often, push changes occasionally (maybe after you feel finished with an exercise?), and go check to see what the .md file looks like on GitHub.  
* If you have issues, let me know! This is new to many of you and may not be intuitive at first. But, I promise, you'll get the hang of it! 


## Instructions

* Put your name at the top of the document. 

* **For ALL graphs, you should include appropriate labels.** 

* Feel free to change the default theme, which I currently have set to `theme_minimal()`. 

* Use good coding practice. Read the short sections on good code with [pipes](https://style.tidyverse.org/pipes.html) and [ggplot2](https://style.tidyverse.org/ggplot2.html). **This is part of your grade!**

* When you are finished with ALL the exercises, uncomment the options at the top so your document looks nicer. Don't do it before then, or else you might miss some important warnings and messages.


## Warm-up exercises from tutorial

These exercises will reiterate what you learned in the "Mapping data with R" tutorial. If you haven't gone through the tutorial yet, you should do that first.

### Starbucks locations (`ggmap`)

  1. Add the `Starbucks` locations to a world map. Add an aesthetic to the world map that sets the color of the points according to the ownership type. What, if anything, can you deduce from this visualization?  
  
```{r}
# Get the map information
world <- get_stamenmap(
    bbox = c(left = -180, bottom = -57, right = 179, top = 82.1), 
    maptype = "terrain",
    zoom = 2)

ggmap(world) + # creates the map "background"
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude, color = `Ownership Type`), 
             alpha = .3, 
             size = .2) +
  theme_map() +
  labs(title = "Starbucks Ownership Around the World")
```
Based on the visualization above, Starbucks in North and South America are mostly Company Owned and Licensed. In Asia and Europe, however, there are many Joint Venture Starbucks in addition to Company Owned and Licensed Starbucks.

  2. Construct a new map of Starbucks locations in the Twin Cities metro area (approximately the 5 county metro area).  
  
```{r}
twincities <- get_stamenmap(
    bbox = c(left = -93.4471, bottom = 44.8173, right = -92.7838, top = 45.1316), 
    maptype = "terrain",
    zoom = 11)

ggmap(twincities) + # creates the map "background"
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude), 
             alpha = 1, 
             size = 2) +
  labs(title = "Starbucks in the Twin Cities", 
       x = "Longitude", 
       y = "Latitude")
  theme_map()
```

  3. In the Twin Cities plot, play with the zoom number. What does it do?  (just describe what it does - don't actually include more than one map).  

Smaller numbers in zoom show less detail, while bigger numbers show more detail.As the zoom number gets bigger, the map becomes more detailed, so if you have a small area the zoom number can be bigger and thus more detailed, but if the area is bigger, the zoom number has to be smaller and less detailed. 

  4. Try a couple different map types (see `get_stamenmap()` in help and look at `maptype`). Include a map with one of the other map types.  
  
```{r}
twincities <- get_stamenmap(
    bbox = c(left = -93.4471, bottom = 44.8173, right = -92.7838, top = 45.1316), 
    maptype = "terrain-lines",
    zoom = 11)

ggmap(twincities) + # creates the map "background"
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude), 
             alpha = 1, 
             size = 2,
             color = "lightgreen") +
  labs(title = "Starbucks in the Twin Cities") +
  theme_map()
```


  5. Add a point to the map that indicates Macalester College and label it appropriately. There are many ways you can do think, but I think it's easiest with the `annotate()` function (see `ggplot2` cheatsheet).
  
```{r}
twincities <- get_stamenmap(
    bbox = c(left = -93.4471, bottom = 44.8173, right = -92.7838, top = 45.1316), 
    maptype = "terrain-lines",
    zoom = 11)

ggmap(twincities) + # creates the map "background"
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude), 
             alpha = 1, 
             size = 2, 
             color = "lightgreen") +
  annotate(geom = "text", y = 44.9416, x = -93.16, label = "Macalester College")  +
  labs(title = "Starbucks in the Twin Cities") +
  theme_map()
```
  

### Choropleth maps with Starbucks data (`geom_map()`)

The example I showed in the tutorial did not account for population of each state in the map. In the code below, a new variable is created, `starbucks_per_10000`, that gives the number of Starbucks per 10,000 people. It is in the `starbucks_with_2018_pop_est` dataset.

```{r}
census_pop_est_2018 <- read_csv("https://www.dropbox.com/s/6txwv3b4ng7pepe/us_census_2018_state_pop_est.csv?dl=1") %>% #read csv into r and creates a new dataset called census_pop_est_2018
  separate(state, into = c("dot","state"), extra = "merge") %>% #The state data was presented with a period preceding the state name. The separate function separates the period from the other characters. 
  select(-dot) %>% #selects all variables/columns except "dot"
  mutate(state = str_to_lower(state)) #turns the state string into all lowercase letters

starbucks_with_2018_pop_est <- #creates new dataset 
  starbucks_us_by_state %>% 
  left_join(census_pop_est_2018,
            by = c("state_name" = "state")) %>% #joins starbucks_us_by_state dataset with the census_pop dataset. since the starbucks_us dataset calls the state variable "state_name" and the census dataset calls the state variable "state", the by line matches those two variables to the same one. 
  mutate(starbucks_per_10000 = (n/est_pop_2018)*10000) #creates variable to show the number of Starbucks per 10,000 people per state
```

  6. **`dplyr` review**: Look through the code above and describe what each line of code does.

  7. Create a choropleth map that shows the number of Starbucks per 10,000 people on a map of the US. Use a new fill color, add points for all Starbucks in the US (except Hawaii and Alaska), add an informative title for the plot, and include a caption that says who created the plot (you!). Make a conclusion about what you observe.
  
```{r}
#US states map information - coordinates used to draw borders
states_map <- map_data("state")

# map that colors state by number of Starbucks
starbucks_with_2018_pop_est %>% 
  ggplot() +
  geom_map(map = states_map,
           aes(map_id = state_name,
               fill = n/est_pop_2018*10000)) +
  geom_point(data = Starbucks %>%
               filter(`Country` == "US") %>%
               filter(`State/Province` != "AK") %>%
  filter(`State/Province` != "HI"), 
             aes(x = Longitude, y = Latitude), 
             alpha = .3, 
             size = .1, 
             color = "goldenrod") +
  expand_limits(x = states_map$long, y = states_map$lat) + 
  scale_fill_viridis_c(option = "plasma") +
  theme_map() +
  labs(title = "Starbucks per 10,000 people",
       fill = "Starbucks per 10,000 People",
       caption = "Plot created by Anna Leidner")
```
#Lighter colors (more Starbucks per 10,000 people) are related to the population size of a city, like in New York, the lighter yellow shows where New York City is, where there are going to be more Starbucks. California shows a similar pattern, where the two splotches of yellow are likely where San Francisco and Los Angeles are. 

### A few of your favorite things (`leaflet`)

  8. In this exercise, you are going to create a single map of some of your favorite places! The end result will be one map that satisfies the criteria below. 

  * Create a data set using the `tibble()` function that has 10-15 rows of your favorite places. The columns will be the name of the location, the latitude, the longitude, and a column that indicates if it is in your top 3 favorite locations or not. For an example of how to use `tibble()`, look at the `favorite_stp_by_lisa` I created in the data R code chunk at the beginning.  
```{r}

#Anna's favorite places 

favorite_by_anna <- tibble(
  place = c("Kimchi Tofu House", "Tono Pizzeria + Cheesesteak", 
            "Macalester College", "Science Museum of Minnesota", "Target Field", 
            "Saint Paul Home", "Riverside Park", "NYC Home", 
            "Jin Fong Restaurant", "The High Line", "Citi Field", 
            "Kate's Seafood", "Long Nook Beach"), 
  long = c( -93.22693673444148, -93.16733278846144, 
           -93.16905451640325, -93.09913377060474,   
           -93.27759701544593, -93.15993888846154,
           -73.9729219893889, -73.9717327732488, 
           -73.97883524441367,  -74.0039163349285, 
           -73.84583203092146, -70.11022135787704,
           -70.03705415706891), 
  lat = c(44.97333972848076, 44.934273777055594, 
          44.93861924693568, 44.946322266714894,  
          44.9818947558888, 44.93189077914104, 
          40.801862889204585, 40.79972265717478, 
          40.78301103574647, 40.751173188177894, 
          40.75725834451115, 41.75483506515295, 
          42.02195492958253), 
  top3 = c("Not Top 3", "Not Top 3", "Top 3", "Not Top 3", "Not Top 3", "Not Top 3", "Top 3", "Top 3", "Not Top 3", "Not Top 3", "Not Top 3", "Not Top 3", "Not Top 3")
)

```

  * Create a `leaflet` map that uses circles to indicate your favorite places. Label them with the name of the place. Choose the base map you like best. Color your 3 favorite places differently than the ones that are not in your top 3 (HINT: `colorFactor()`). Add a legend that explains what the colors mean.  
  
```{r}
factpal <- colorFactor(topo.colors(3), favorite_by_anna$top3)

leaflet(data = favorite_by_anna) %>% 
  addProviderTiles(providers$Stamen.Terrain) %>% 
  addCircles(lng = ~long, 
             lat = ~lat, 
             label = ~place, 
             weight = 5, 
             opacity = 1,
             color = ~factpal(top3))  %>%
  addPolylines(lng = ~long, 
               lat = ~lat, 
               color = col2hex("darkred")) %>%
  addLegend(pal = factpal, 
            values = ~top3, 
            opacity = 0.5, 
            title = NULL,
            position = "bottomright") 

```

  
  * Connect all your locations together with a line in a meaningful way (you may need to order them differently in the original data).  I reordered the points so that the NYC Home, the home I grew up in, is the midpoint between the points in Massachusetts and Minnesota.
  
  * If there are other variables you want to add that could enhance your plot, do that now.  
  
## Revisiting old datasets

This section will revisit some datasets we have used previously and bring in a mapping component. 

### Bicycle-Use Patterns

The data come from Washington, DC and cover the last quarter of 2014.

Two data tables are available:

- `Trips` contains records of individual rentals
- `Stations` gives the locations of the bike rental stations

Here is the code to read in the data. We do this a little differently than usualy, which is why it is included here rather than at the top of this file. To avoid repeatedly re-reading the files, start the data import chunk with `{r cache = TRUE}` rather than the usual `{r}`. This code reads in the large dataset right away.

```{r cache=TRUE}
data_site <- 
  "https://www.macalester.edu/~dshuman1/data/112/2014-Q4-Trips-History-Data.rds" 
Trips <- readRDS(gzcon(url(data_site)))
Stations<-read_csv("http://www.macalester.edu/~dshuman1/data/112/DC-Stations.csv")
```

  9. Use the latitude and longitude variables in `Stations` to make a visualization of the total number of departures from each station in the `Trips` data. Use either color or size to show the variation in number of departures. This time, plot the points on top of a map. Use any of the mapping tools you'd like.
  
```{r}
stationTrips <- Trips %>%
   left_join(Stations, 
            by = c("sstation" = "name")) %>%
  #select(sstation, client) %>%
  group_by(lat, long) %>%
  mutate(total = n()) 
  #summarize(n = n()) 


washingtondc <- get_stamenmap(
    bbox = c(left = -77.1869, bottom = 38.8107, right = -76.8374, top = 38.9684), 
    maptype = "terrain",
    zoom = 12
)
ggmap(washingtondc) +
  geom_point(data = stationTrips, 
             aes(x = long, y = lat, color = total),
             size = .8) +
  scale_color_viridis_c(option = "magma") +
  theme_map() +
  #theme(legend.background = element_blank()) +
  labs(title = "Total Number of Departures By Station", 
       fill = guide_legend("Number of Departures"))
  
```
  
  10. Only 14.4% of the trips in our data are carried out by casual users. Create a plot that shows which area(s) have stations with a much higher percentage of departures by casual users. What patterns do you notice? Also plot this on top of a map. I think it will be more clear what the patterns are.
  
```{r}
washingtondc <- get_stamenmap(
    bbox = c(left = -77.1869, bottom = 38.8107, right = -76.8374, top = 38.9684), 
    maptype = "terrain",
    zoom = 12
)

stationTrips <- stationTrips %>%
  mutate(propcasual = mean(client == "Casual"))

ggmap(washingtondc) +
  geom_point(data = stationTrips, 
             aes(x = long, y = lat, color = propcasual),
             size = .8) +
  scale_color_viridis_c(option = "magma") +
  theme_map() +
  labs(title = "Percentage of Departures by Client Type", 
       fill = "Proportion Casual Users")
  #+
  #theme(legend.background = element_blank())
```
  
I notice that in the map above, the proportion of Casual Clients is higher near the heart of that downtown area and where the National Mall is. One of the pale dots is near the Lincoln Memorial and the other is near the Washington Monument. This makes sense as they would be the areas with the highest population of tourists/casual users.

### COVID-19 data

The following exercises will use the COVID-19 data from the NYT.

  11. Create a map that colors the states by the most recent cumulative number of COVID-19 cases (remember, these data report cumulative numbers so you don't need to compute that). Describe what you see. What is the problem with this map?
  
  
```{r}

#covid19$state <- tolower(covid19$state)

covid19_state <- covid19 %>%
  group_by(state) %>%
  arrange(desc(date)) %>%
  #mutate(cases = as.character(cases)) %>%
  mutate(cases = as.integer(cases)) %>%
  mutate(state = tolower(state)) %>%
  slice(1) 
  
states_map <- map_data("state")

covid19_state %>%
  ggplot() +
  geom_map(map = states_map, 
           aes(map_id = state, 
           fill = cases)) +
  
  expand_limits(x = states_map$long, y = states_map$lat) +
  theme_map() +
  #scale_fill_viridis_c(option = "plasma") +

  #scale_fill_viridis_c(option = "plasma", direction = -1) +
  labs(title = "Cumulative COVID Cases in the US", 
       fill = "Cumulative Cases", 
       caption = "Plot Created by Anna Leidner")
```

In the map above, we see that the most recent cumulative number of COVID cases per state. The darker the color/the closes to dark purple, the higher the number of cumulative cases is. The results are to be expected as the states with the largest populations like California, Texas, Florida, and New York, have had the highest number of cumulative COVID cases. The map does not show how many COVID cases there are in relation to the population/does not take population into account. 

  12. Now add the population of each state to the dataset and color the states by most recent cumulative cases/10,000 people. See the code for doing this with the Starbucks data. You will need to make some modifications. 
  
```{r}
census_pop_est_2018 <- read_csv("https://www.dropbox.com/s/6txwv3b4ng7pepe/us_census_2018_state_pop_est.csv?dl=1") %>% #read csv into r and creates a new dataset called census_pop_est_2018
  separate(state, into = c("dot","state"), extra = "merge") %>% #The state data was presented with a period preceding the state name. The separate function separates the period from the other characters. 
  select(-dot) %>% #selects all variables/columns except "dot"
  mutate(state = str_to_lower(state)) #turns the state string into all lowercase letters

covid19_state <- covid19 %>%
  group_by(state) %>%
  arrange(desc(date)) %>%
  #mutate(cases = as.character(cases)) %>%
  mutate(cases = as.integer(cases)) %>%
  mutate(state = tolower(state)) %>%
  slice(1) 

covid19_10000 <- #creates new dataset 
  covid19_state %>% 
  left_join(census_pop_est_2018,
            by = c("state"))  #joins starbucks_us_by_state dataset with the census_pop dataset. since the starbucks_us dataset calls the state variable "state_name" and the census dataset calls the state variable "state", the by line matches those two variables to the same one. 
  #mutate(starbucks_per_10000 = (n/est_pop_2018)*10000) #creates variable to show the number of Starbucks per 10,000 people per state

covid19_10000 %>% 
  ggplot() +
  geom_map(map = states_map,
           aes(map_id = state,
               fill = cases/est_pop_2018*10000)) +
  expand_limits(x = states_map$long, y = states_map$lat) + 
  #scale_fill_viridis_c(option = "plasma") +
  theme_map() +
  labs(title = "Cumulative COVID Cases per 10,000 people",
       fill = "Cases per 10,000",
       caption = "Plot created by Anna Leidner")
```
  
  
  13. **CHALLENGE** Choose 4 dates spread over the time period of the data and create the same map as in exercise 12 for each of the dates. Display the four graphs together using faceting. What do you notice?
  
## Minneapolis police stops

These exercises use the datasets `MplsStops` and `MplsDemo` from the `carData` library. Search for them in Help to find out more information.

  14. Use the `MplsStops` dataset to find out how many stops there were for each neighborhood and the proportion of stops that were for a suspicious vehicle or person. Sort the results from most to least number of stops. Save this as a dataset called `mpls_suspicious` and display the table.  
  
```{r}
mpls_suspicious <- MplsStops %>%
  group_by(neighborhood) %>% #this finds total stops by neighborhood
  #mutate(totneighbor = n()) %>%
  #distinct(neighborhood, .keep_all=TRUE) %>%
  mutate(stops = n(),
         prop_suspicious = mean(problem == "suspicious")) %>%
  #slice(1) %>% #do i need this
  arrange(desc(stops)) #%>%
  #select(neighborhood:prop_suspicious)

mpls_suspicious
```
  
  
  15. Use a `leaflet` map and the `MplsStops` dataset to display each of the stops on a map as a small point. Color the points differently depending on whether they were for suspicious vehicle/person or a traffic stop (the `problem` variable). HINTS: use `addCircleMarkers`, set `stroke = FAlSE`, use `colorFactor()` to create a palette.  
  
  
```{r}
factpal <- colorFactor(topo.colors(5), MplsStops$problem)

leaflet(data = MplsStops) %>% 
  addProviderTiles(providers$Stamen.Terrain) %>% 
  addCircles(lng = ~long, 
             lat = ~lat, 
             label = ~neighborhood, 
             weight = 5, 
             opacity = 1,
             stroke = FALSE,
             color = ~factpal(problem)) %>%
  
  addLegend(pal = factpal, 
            values = ~problem, 
            opacity = 0.5, 
            title = NULL,
            position = "bottomright") 


```
  
  16. Save the folder from moodle called Minneapolis_Neighborhoods into your project/repository folder for this assignment. Make sure the folder is called Minneapolis_Neighborhoods. Use the code below to read in the data and make sure to **delete the `eval=FALSE`**. Although it looks like it only links to the .sph file, you need the entire folder of files to create the `mpls_nbhd` data set. These data contain information about the geometries of the Minneapolis neighborhoods. Using the `mpls_nbhd` dataset as the base file, join the `mpls_suspicious` and `MplsDemo` datasets to it by neighborhood (careful, they are named different things in the different files). Call this new dataset `mpls_all`.

```{r, eval=FALSE}
mpls_nbhd <- st_read("Minneapolis_Neighborhoods/Minneapolis_Neighborhoods.shp", quiet = TRUE)

mpls_all <- mpls_nbhd %>%
  left_join(mpls_suspicious, 
            by = c("BDNAME" = "neighborhood")) %>%
  left_join(MplsDemo, 
            by = c("BDNAME" = "neighborhood"))
mpls_all
```


  17. Use `leaflet` to create a map from the `mpls_all` data  that colors the neighborhoods by `prop_suspicious`. Display the neighborhood name as you scroll over it. Describe what you observe in the map.
  
```{r}
#pal2 <- colorFactor(topo.colors(5), mpls_all$prop_suspicious)

pal2 <- colorNumeric("magma",
                    domain = mpls_all$prop_suspicious)

leaflet(data = mpls_all) %>% 
  addProviderTiles(providers$Stamen.Terrain) %>% 
  addCircles(lng = ~long, 
             lat = ~lat, 
             label = ~BDNAME, 
             weight = 3, 
             opacity = 1,
             color = ~pal2(prop_suspicious)) %>%
  addLegend(pal = pal2,
            values = ~prop_suspicious,
            opacity = 0.5,
            title = NULL,
            position = "bottomright")
```
  
In the map, there is a clear lines separating different neighborhoods by different suspicious proportions.  I would have to guess that the neighborhoods with the darker dots (smaller proportion of suspicious stops), are more likely to be White neighborhoods, while the neighborhoods with the more yellow dots (larger proportion of suspicious stops), are more likely to be neighborhoods with a larger population of people of color.


  18. Use `leaflet` to create a map of your own choosing. Come up with a question you want to try to answer and use the map to help answer that question. Describe what your map shows. 

  
```{r}

#Do the number of suspicious police stops change based on the demographics of the neighborhood?

#pal3 <- colorFactor(topo.colors(5), mpls_all$stops)
pal3 <- colorNumeric("magma",
                    domain = mpls_all$stops)

leaflet(mpls_all) %>% 
  addProviderTiles(providers$Esri.NatGeoWorldMap) %>% 
  addCircles(lng = ~long,
             lat = ~lat,
             color = ~pal3(stops),
             label = ~race, 
             weight = .3,
             opacity = .4) %>% 
  addLegend("topleft",
            pal = pal3,
            values = ~stops)
```
  
When looking at the above map, it seems as though the number of stops is affected by the population of the area, or density of commuters. The number of stops does seem loosely correlated with the suspicious proportion, but the correlation is not extremely strong or clear. 
  
  
## GitHub link

  19. Below, provide a link to your GitHub page with this set of Weekly Exercises. Specifically, if the name of the file is 04_exercises.Rmd, provide a link to the 04_exercises.md file, which is the one that will be most readable on GitHub.

[Github Link Exercise 4](https://github.com/aleidner6/Exercise4/blob/master/04_exercises.md)

**DID YOU REMEMBER TO UNCOMMENT THE OPTIONS AT THE TOP?**
